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Finding the Fourth Proportional to 621.64, 863.72 and 613.88

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Solution

The fourth proportional to 621.64, 863.72 and 613.88 is: 852.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.64 : 863.72 = 613.88 : x
  2. Step 2: Convert to fraction form
    621.64/863.72 = 613.88/x
  3. Step 3: Cross multiply
    621.64x = 863.72 × 613.88
  4. Step 4: Simplify right side
    621.64x = 530,220.43
  5. Step 5: Solve for x
    x = 530,220.43/621.64
  6. Step 6: Final answer
    x = 852.94

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.